Akitaya, H., J. Brunner, E. D. Demaine, D. Hendrickson, V. Luo, and A. Tockman. “Complexity of Simple Folding of Mixed Orthogonal Crease Patterns: Discrete and Computational Geometry, Graphs, and Games”. Thai Journal of Mathematics, vol. 21, no. 4, Dec. 2023, pp. 1025–1046, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1563.